Barrel: 13.7" 416R. Chambered in .308, 1:10 twist, and a mid-length gas system. Barrel is finished off with a 12.5" Quad Rail, a JMAC GFHCE-R muzzle device, and Cerakote Finished. Upper: Forged 7075 AR upper is hard coat anodized black for durability. These uppers are T-Marked engraved. Bolt Carrier Group: Sabre AR-10 BCG with Sprinco Gas Rings, Sprinco Ejector Spring, Sprinco Extractor Spring, and OCK's Gas Key Fasteners